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Light cone effect on the reionization 21-cm signal – II. Evolution, anisotropies and observational implications
journal contribution
posted on 2023-06-09, 07:01 authored by Kanan K Datta, Hannes Jensen, Suman Majumdar, Garrelt Mellema, Ilian IlievIlian Iliev, Yi Mao, Paul R Shapiro, Kyungjin AhnMeasurements of the H I 21-cm power spectra from the reionization epoch will be influenced by the evolution of the signal along the line-of-sight direction of any observed volume. We use numerical as well as seminumerical simulations of reionization in a cubic volume of 607 Mpc across to study this so-called light-cone effect on the H I 21-cm power spectrum. We find that the light-cone effect has the largest impact at two different stages of reionization: one when reionization is ~20 per cent and other when it is ~80 per cent completed. We find a factor of ~4 amplification of the power spectrum at the largest scale available in our simulations. We do not find any significant anisotropy in the 21-cm power spectrum due to the light-cone effect. We argue that for the power spectrum to become anisotropic, the light-cone effect would have to make the ionized bubbles significantly elongated or compressed along the line of sight, which would require extreme reionization scenarios. We also calculate the two-point correlation functions parallel and perpendicular to the line of sight and find them to differ. Finally, we calculate an optimum frequency bandwidth below which the light-cone effect can be neglected when extracting power spectra from observations. We find that if one is willing to accept a 10 per cent error due to the light-cone effect, the optimum frequency bandwidth for k = 0.056 Mpc-1 is ~7.5 MHz. For k = 0.15 and 0.41 Mpc-1, the optimum bandwidth is ~11 and ~16 MHz, respectively.
Funding
Astronomy rolling grant; G0278; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I000976/1
Astronomy Centre Rolling Grant; G0679; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/F002858/1
History
Publication status
- Published
File Version
- Published version
Journal
Monthly Notices Of The Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Issue
2Volume
442Page range
1491-1506Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Astronomy Centre Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2017-07-06First Open Access (FOA) Date
2017-07-06First Compliant Deposit (FCD) Date
2017-07-06Usage metrics
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